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1 <br /> 1 <br /> . 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The results of this investigation indicate that impacts to soil and groundwater beneath the site <br />' appear to be limited to the proximity of the former UST The nature of the gasoline in soil and <br /> groundwater appears to be relatively free of oxygenate compounds, except for 45 µg/l of MTBE in <br /> groundwater at MW-1 <br /> In soil, the highest concentrations of gasoline compounds were observed at a depth of 15 feet <br /> near the former UST Based on the results of soil samples collected at 20 and 25 feet bgs near <br /> the former UST, the vertical extent of impacted soil was defined to a depth of approximately 20 <br /> feet bgs Laterally, the extent of impacted soil appears to be limited to the vicinity of the former <br /> UST system <br />' In groundwater, significant concentrations of gasoline compounds including MTBE were only <br /> detected in the monitoring well adjacent to the south end of the former UST Given that the <br /> groundwater flow direction was calculated toward the northeast, the lateral extent of impacted <br /> groundwater appears to be defined downgradient by MW-2 and MW-3 <br /> Based on these conclusions, Ramage Environmental recommends that the three monitoring wells <br /> be monitored and sampled on a quarterly basis to confirm gasoline concentrations and <br /> groundwater flow and gradient characteristics The first quarterly groundwater monitoring event is <br /> scheduled for October 2002 <br /> 1 <br /> 1 <br /> • 13 <br />